Capsule or container for gases or liquids under pressure



March 6, 1928.

R. H. CAMPBELL CAPSULE OR CONTAINER FOR GASES 0R LIQUIDS UNDER PRESSUREFiled Jan, 15, 1926 2 Sheets-$heet 1 2 Sheets-Sheet 2 R. H. CAMPBELLCAPSULE on CONTAINER FOR GASES OR LIQUIDS UNDER PRESSURE Filed Jan. 15,1926 Fly 5.

March 6, 1928.

4 rt dddd// W B M I F I w??? 1 Patented Mar. 6, 1928.

UNITED STATES 1 1,661,997 PATENT OFFICE.

ROBERT HUNTER CAMPBELL, OF LONDON, ENGLAND.

CAPSULE ,OR CONTAINER FOR GASES OR LIQUIDS UNDER PRESSURE.

i Application filed January 15, 1926, Serial No This invention relatesto capsules, or containers designed to confine fluids (gases, orliquids) under pressure and is a modification of, or improvement upon,the invention described and claimed in the specification of U. S.Letters Patent Number 1,387,451, granted me August 16th, 1921.

The neck of the capsule, or container, described and shown in thespecification of the said Letters Patent is internally screwthreadedadjacent to the shoulder, or the like, against which scaling is effectedby a device consisting of a closing element (such as a hard metal disc)and a plastic element (such as a ring of soft or plastic metal) which ispressed into the said screw-threaded part of the said neck and retainsthe said closing element in sealing position in the neck of the saidcapsule, or container; the said closing element and the said plasticelement being two distinct and separate elements.

This invention has for its object to provide an improved and simplifiedclosing device which is eflicient in use and which can be easily andcheaply manufactured, and consists in the modified one-piece closingelement, as hereinafter described, wherein the aforesaid closing elementforms part of the plastic element and has a part which can be easilypunctured, to liberate the gas, or liquid, when required, or a partwhich can be easily broken to effect the liberation of the said gas orliquid.

I will describe my invention with reference to the accompanying drawingin which Figure 1 shows, in section, one form of closing device inaccordance with this invention in the position it occupies when thecapsule, or container, is being charged with gas, or liquid, and Figure2 shows, in section, the said device, pressed into the internallyscrew-threaded neck of the said capsule, or container, to effect a gastight closure. Figures 3 and 4 are similar sections to Figures 1 and 2showing a modified form of closing device to that shown in the saidFigures 1 and 2, and Figure 5 shows in section, a closing device forcapsules, or containers, intended for use in apparatus such as describedand claimed in the specification of my copending U. S. application,Serial 81,511, and in Great Britain November 4, 1925.

to be pressed and 4 the shoulder projecting inwardly to the base of thethreading in the said neck constituting, through a pack ing ring, orwasher, 5, the seat for the said closing device. tions shown the closingdevice 3 consists of a closed hollow plug of soft, or plastic, metalhaving a part 6 of considerable thickness constituting the metal whichis to be pressed into the screw-threaded part 2 of the neck ofthe saidcapsule or container. The thickened part 6 of the said closing plug isof a diameter slightly less than that of the internally-screw-threadedpart 2 and it has, integral with its underside, a downwardly projectingannular or ring-like, part 7 adapted to enter the contracted port-ion 8of the neck of the said capsule or container.

The hollow closing plug 3 shown in Figures 1 and 2 is closed by adiaphragm 9 (adjacent the junction of the thickened part 6 and theannular, or ring-like part 7) which is made relatively thin so that itcan be easily punctured to liberate the gas, or liquid, in the capsule,or container 1 when required. In charging the capsule, or con tainer, 1the closing plug 3 is supported on the open end of the said capsule, orcontainer, by lugs, or projections, 10 formed on the exterior of thethickened part 6 of the said closing plug which lugs, or projections,rest upon the top of the said capsule, or container, leaving sufficientspace between the exterior of the said thickened part and the interiorof the neck of the said capsule, or container, forthe gas, or liquid, tobe admitted from the charging machine in the usual manner. \Vhen thecapsule, or container, has been charged to the desired pressure theclosing plug 3 is pressed by a plunger 11 into the neck of the saidcapsule or container, and onto the seat 4 therein, and by the continuedpressure of the said plunger the metal of the thickened part 6 of thesaid closing plug is caused to spread, flow, or s uirt, outwards so asto enter and be firmly he din the internally crew-threaded part of thesaid neck and effect a tight closure of the said capsule, or container.When it is desired to liberate the gas or liquid, ;the diaphragm 9 ispunctured by any suitable, or known, means. The plunger 11 may, asdescribed in the before mentioned specification of U. S. Letters PatentNumber 1,387,451, be provided with projecting feathers 15 which formlongitudinal grooves In each of the inodifica- 16 in the internalsurface of the thickened part 6 of the closing plug as the said plungeris advanced, so that when it is desired to re-use the capsule, orcontainer, it is only required to hold the said capsule, or container,in a suitable appliance to prevent it.

turning, and to apply to it a spindle corresponding to a screw-driverand having a male end adapted to engage with the grooves formed in theinternal surface of the said thickened part of the closing plug. Whenthe appliance is rotated in the direction to unscrew the whole closingplug will be easily removed and the capsule, or container, will be readyfor another closing plug, and re-use.

The hollow plug 3 shown in Figures 3 and 4 is similar to that shown inFigures 1 and 2 with the exception that it is provided with anexternally screw-threaded stem 12 extending from, and integral with, theupper side of the thickened part 6 of the said hollow plug, and thisstem is closed, at, or towards, its upper end by a diaphragm 9 which,like the diaphragm shown in Figures 1 and 2, can be easily punctured toliberate the gas, or liquid, when desired. 1 The screw-stem 12 isprovided to adapt it for use in apparatus where the end of the saidcapsule or container, can be screwed in to make a joint on the top ofthe closing part. The hollow plug is supported on the top of thecapsule, or container, 1 by the lugs, or projections 10 when the saidcapsule, or container, is being charged and when charged the said hollowplug is pressed by the plunger 11 into the neck of the said capsule, orcontainer,

as effect a tight closure in the same manner as that already describedwith reference to Figures 1 and 2, and therefore no further descriptionis necessary, but the lower end of the said plunger is hollowed at 13 toreceive the said screw-threaded stem 12.

The closing plug 1 shown in Figure 5 is similar to that shown in Figures3 and 4, with the exception that the extending externally screw-threadedstem 12 is not adapted to be punctured, it bein .solid at its upper partas shown at 14. his ty )e of closure is more especially intended or usewith capsules, or containers, a plied to apparatus such as is describedin tile before mentioned specification of my copending U. S.application, Serial Number 64,190, filed October 22, 1925, wherein theliberation of the gas, or liquid, is effected by breaking the said stemat a weak part, that is, thehollow part adjacent the said solid upperpart 14 of the said stem 12. of the capsule, or container, 1 and themethod and means for efi'ect-ing a tight closure is precisely the sameas that already described with reference to Figures 3 and 4 andtherefore no further description is necessary.

'What I claim is For use with a container designed to confine fiuidsunder pressure having an internally threaded neck with a shoulderprojecting inwardly at the base of the threading, a one-piece closingelement made wholly of soft metal adapted to spread outward underpressure and effect a tight closure with the threaded neck and lugs uponsaid closing element adapted to support the same on the open end of thecontainer when the latter is being charged.

In testimony whereof I have signed my name to this specification.

ROBERT HUNTER CAMPBELL.

The charging

